docs: def loading_failed(self, rdf_format_opts, uri=""):
          """default message if we need to abort loading"""
          if uri:
              uri = " <%s>" % str(uri)
          printDebug(
              "----------\nFatal error parsing graph%s\n(using RDF serializations: %s)"
              % (uri, str(rdf_format_opts)), "red")
          printDebug(
              "----------\nTIP: You can try one of the following RDF validation services\n<http://mowl-power.cs.man.ac.uk:8080/validator/validate>\n<http://www.ivan-herman.net/Misc/2008/owlrl/>"
          )
  
          return